If you put a frog in a pot of room-temperature water and gradually bring the water to a boil, the frog remains in the water and dies. Humans should know better when it comes to this kind of thing says commentator Ellen Moyer.

Massive snowstorms in Europe,floods in Australia, arctic cold in the northeastern U.S and record warmth at the poles.Some scientists are trying to draw a link between this roller-coaster weather and global warming.Dr.Michael Rawlins a climatologist who manages the climate system research center at Umass Amherst says these researchers believe changes to the arctic fence–is thought to be a contributing factor.